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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3716ef6e1acb505c6d290c802c55d687c15a1701cf8e23a92ed0a4dc035357b' 
  AND token = 'EYbQPH6ywk5xmjf7jY38cG4o/9S1Q9Oy9Agje9tE7QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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