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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97505de6a991c9b7ed053b9006c13b3d8a1cf636b4d9515e714031aa5c795da8' 
  AND token = 'u1n3wAWmFwdIIJ8O8CVnTE1pw9kL757luhaVnKVunmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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