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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b423797d05157f8c709d6a3e3589e407e7d3f1bfe19eef463718eaa4b6585d0' 
  AND token = 'FFxsm8IGFIp/eYPPIoh19bt4XEugIbtPtItMbmrnfuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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