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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c5b6a824d627eecf9d054efbf5d2d87ae7c5afef42232b2501c6640729b308' 
  AND token = 'mwLT13uh5I+EGRyGfPPOgl1T6SGveM8a10ntD3z5xME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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