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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab7a10df9e8d4823070a731a18a86102b014b70b0da552d7cb3b81a47a3b042' 
  AND token = 'sAeX6vOsSxqaitd47doJnhEsOyD8NqMvaGX9PaAuvIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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