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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93f0d4a04f92918dfbfb8374eb7a95b42d1cf65aace3c179aa092aa36b0bb58' 
  AND token = 'mvlTCEjgbme0uDCG9uDoADHG3DBBeIJ2hPGjsYpCmRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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