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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f8587abf47136e7d70d4c2f2a6fdaba1af769f341a38c8837415024e5adc66' 
  AND token = 'p25B4K5hBaMJ8KP5OHTsItMl7HuCSyawUyJDQdi/hoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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