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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247e1f8e2c8d15ef0923f92653bda73dd1aa287976e3a13545b04e6614c0f5ad' 
  AND token = '15u+vkJhhpay4hu8Eo0zVsDKbE4iULT360/+g3w56tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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