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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7b3a5071cd712c933510e300a6e8f032e909e636dda4501a5bea1f73832a8f' 
  AND token = 'yDPgG2pkjnLL5Bc/N1hc07SyGrs3/z+q1XZ1pHreCyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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