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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9323d7d0e344e848a6001cad112948f0bda7ec884ac3b50876b6fea57626aff3' 
  AND token = '7vI32Ls8tDtc30CXDXYFyUXdWIk89OXNAlqtb6aWS4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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