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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0392f0986b797ce9f5e561195c3165a524ec1cd71e597aef6b04ac4c42e7a5b6' 
  AND token = 'CnK/g5aw99RSqbeAw6euF9sO7ySJ0tjaa7IzvKj9sM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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