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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb89b93c265f608730ecc1b2736b93cfc271323f6c813d90cee66c9cda61d23e' 
  AND token = 'a37NydFGFJJN1L578BttzTqDIS30zYeSwT6DoAFHJNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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