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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567b6e722f630561ef8ff24fdcfda6ac25e3ae9f4bbabdb5721514e33e5caf94' 
  AND token = 'nirF9KXN1jWql15H+j1k97yNDdr+2eD0vfCOFGEF47E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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