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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71350bba0e53821dca3c8a040b879d33bf4ad033e22a58994a844bf19cf8a948' 
  AND token = 'r1TR0hVLRw5wxch0bng/DWxAMgE+J6OPZFjHN63KsOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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