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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d411e15d5b72d69bc1b3a41c1ac9336f90f0d7f2f3e5510394e53729d6b28e' 
  AND token = 'Rgaof04Ayd9Z5r4oV40ELv8b/QbSQOrZtis5w5C/M5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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