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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682a534cdf19709647cff4cd0fd99bd141282a6f799c8e4fcb86e31eda03cfed' 
  AND token = 'ijW/fLIH4nxovudFsUEAqFEUnJCXsDyqLFIj8allyxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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