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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cce9a4f9cfcd6cf66c7a1df0e95a50a56f997d92568a7bed319faefd41d097d' 
  AND token = 'v/Jdmq9a6My2INh4VyfFvn438ZJiUFJbUjpKpgxT68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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