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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a88f6869328f7c4186c350e3084e1217e5b4883e25870ca9427de4f77f9a38' 
  AND token = 'DZsUHmQ8KUdQtqVF48BXqwWserV+TP6WQ2anHShQYEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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