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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fca4679f36959df3de479ebb75bd4fb931ea85e2bd871444a873e206d27261' 
  AND token = 'Su7U6ajwk2uNhmuSZLQVVNhG5WOxPr48OIT/MPCA1Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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