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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ee05de829afb9026ce40d4eafa33da684901bb735ef08ccdfd6da7826b3788' 
  AND token = 'qdVn/8ilzpAgdEm4cNLybQUZqK4z3toU41oQlGslXr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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