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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36982aee71baf93661ea1885a09669e885a1d2000b7d6919e72d34169092239a' 
  AND token = 'A+pHBI2iq8cIn1LTkqq96iEDJgfqqaDCEbOIL2TXeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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