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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9416e69dabbc4ec258f6a8dcb3f3ed37b5067b8014ceae85cc70150e2250d9c6' 
  AND token = '9rPue59YxUXJqW0M5Ny/PoH6kNN5+GcrI5zBKmLw/pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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