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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293f289bd5be32855ac163af857b1a89ead1916f6d91993760953eaa6b12fda6' 
  AND token = 'oBRE/KEom7jk8uh4TDvqHzDQgAqoIz7G/rT2jRrj8dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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