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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8240f5293ff67ac648f622c1d7d33c462b02d7f9e5a60fb7739255acefcdd4f' 
  AND token = 'cPxzasXHcAQzTDRX9eSjJeRRbuGCoKuRsmCMcLt/zz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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