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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71ddfb371bba7cc12a4a8380960f993e3eaa66af1e6796fa57a265e638047d' 
  AND token = 'D7v9RpkIHNgqpKxd24nsUc7oIOYluqcYkPeZ9nd7qCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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