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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9e310b415e87947f25ec2b80d3410cac7a23a3d997ce3a45c1af6dea1c1fc8' 
  AND token = 'vekMITOgTjW7/16T0ovfWvKv8LGg4yoBrh6cZzQQNBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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