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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a871c0008fc29aa0e5e135da6df54f0c8c0a8542a01e9590b234035cf3ad8c2' 
  AND token = 'u3bgzcvtUnko0gTy2y7txPx6vFVEOniaghriRG09M3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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