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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3c9db6c9a30a0514692f5c990ed221b47871efaf74f130455215fbc3cae7a9' 
  AND token = '+VGhCHsSRMNJSW6d3Zs40sP2IbAz69Qyvi3E/bgfcuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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