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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170677fffcfb3883967ea7e96f7294476bf65047611e8730e611fb36cd0071a2' 
  AND token = '9cwSULyLuLUDMOQ9Q4Gbcp3KlUmlI75llO5nSjfvHWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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