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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237bb6e61b49167869bdfa774508ba34ed415231c2ca4f056d9319ed9ef4c003' 
  AND token = 'OELRJijfDLZ6vCYBbR5GDRJeoE3Tri84f9rumILlFLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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