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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58edf6b9bee204660edfebce1fac149200c6f8153ee219b2ff40a47cdc9bbd1f' 
  AND token = 'GjCGxKFeNbMaS4ogB794UJal1gjwJARj/YzOvvuyxs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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