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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59730b16ec1093d933b1c18595c0557a2df0049cfc3214c6762f07ee9e687086' 
  AND token = 'nN5Hr50TYlQFH759U6IP1tpLYFzkQWU33tQj7fVeChU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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