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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14850206e5d5c179dd30a6e7934e48dcc550e56060263ff7e41aaf1ee970eb5f' 
  AND token = 'LVvtq8f1P2S5kBWE4V9RafcU35jGq0dDtc7v1CSsnzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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