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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d280248e6766379a0f3f632507e1ca75b1024040b2957f161b6041b5b9eebc' 
  AND token = '6QKNdB3uST15wxw4LB7SF6/iUCjdD1bu3zAfNqgFa04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}