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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3b3745b9d6e88d02f2d8e4067cb339ac1518336ce7f3710c0d1b17ae2cdf1c' 
  AND token = 'cTRN2XYrG6RD4YxqEP9lglz932vnct0coLGFx9RfzDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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