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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8871f753cfa47da471e856488808105de10ee269f31f4b5440ea4e83d4889d9' 
  AND token = '8WZE0nzYFm2roXfg01f7HATWZBXf+OdZyN3mDSZ7zmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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