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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f3011bda8af6e43ee58a8d2d2ed841a0befc4e5021759c281588e179be41f9' 
  AND token = 'ZnTedb/vk5CgAHiJSaX1Npf6SsqquaDf5ALWvy6/VZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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