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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be6eafd2775c1754b30cd7e1135ae110aa9d9ffba629dbf17a79b8fa672fabf' 
  AND token = 'YvdFAH6jwIpmzmX/44vevnIlo/6lMecsYK0O7e2GnKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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