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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a8968e6b4bdec254f96c1d090aed45b909a5b3e619be1db5a700e8e66f69c7' 
  AND token = 'TeX2H3YYDMl2fINsD/IQAhRzQ9q/BPk5NnlNlKtB+kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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