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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e775fb95fb593f4baedd970b12092660c4b73e5e97ca49c31bb0a8e04125cc22' 
  AND token = 'Vut01Af41KxOior9Z6p4YS1U+SfJXFqs/E9fJwAHK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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