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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad8ba7877ed1cc38033174b531b0ac3fca8ee83f4ddf2e243705240778baca9' 
  AND token = '4utZsm6htrxfBILPBMrrKx1q16MBU321uY2zcLYmJ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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