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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c6e0b5d296c4f2ca6804eed4be9f0d7476b04afa81ad4e18444d6a921564a8' 
  AND token = 'rE0DTo2sZ10NfHAK8hjZl/S/fHgl3fbieHt++hGExR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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