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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cbdef5fa62465abcf4ef014637873f8dbc323c55d5dfaaeea78c32d6ffa3a2' 
  AND token = '1shXY8UB9KSS1WGJQ48CkW2QOtKyPEhrSxS+DLHFTWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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