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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3d2b75788516e58b51eb9458a203ebe9fb11a7f3146822a21d5b2a93a40d7d' 
  AND token = 'x4GhbvNC5Kn7gpOdDbasUEUWVD3PYgqa0p+g6IfRqcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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