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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29c4929c5d788c2eea007c4b5c0d7da62bcd918c61a87d9ca87609f3e21d8bb' 
  AND token = 'eao5iX57V4PoYGH5giP60vmqdRCb4v76FMaXXdiHYvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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