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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dc63143e44ed02d2094aaebee6ea8ac4b4afd5111d668a7134da59afad1ed9' 
  AND token = 'ICVcfPpYwnE4C9zGsL5mBztYR4RA3bE/vV2uiR6E2tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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