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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60076a5a80c4f9c71e051aceaea402e802a369d4ba39282c9a10232eb1f44b99' 
  AND token = 'zXmhxzwKxBML4snwk4NglxmQqgqakbos8irrfZ2qVVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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