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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d9f3687d8f1911a65f4d54a495d9d789954291722debcaa292b15271de7fe2' 
  AND token = 'ro1C6y0nsKX0zTWZnhliieA1b17o+XKJmdY0JNw2xnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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