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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1957265f0f7e81c70b08b15c45721f57e7ea6a7ede506bc2eee21247a1c50a' 
  AND token = '7b+inA8fKCh5qc6Q8JsBkey3JVlHhRh6huKcLYGTevg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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