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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8563584cdbb725d32181e4ac7750a4475c5f7b6ca54d3fb9eb54c60887f3afcd' 
  AND token = 'iHwKGlRfgJnK6sd37SvmRq6ntHTivT9vPp/8502iiX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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