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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f013d0dd74c7235baf21e0615d38eddd0c065d1b633961243c1069390386ec' 
  AND token = '74G7VAJ59ayJ+E50hRrDom1yebF2nNizQcm7g8lvfV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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