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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e38d5f8f464690caf960682412d1592e41dd36933a800d09974cb8d6ee7a3ab' 
  AND token = 'Dl+NdAXr5acgCj0VXL8MIXmlzweU/1s9BBAZ5dgFq4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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