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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3647ec91b2f1f84fef8195ea0eca6113085cc1229dc31ddf493542069e4056e7' 
  AND token = '3bdmW3bD+HcK+eLwcvix72htGsADoWBmGqddHwu/NBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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