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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a773fab0b8e80f00f2c7654c4483dcf566bd406feaa1ef4f5c443a9437345e' 
  AND token = 'I28QWbQvKg6JJ5ScGNei4A2w3wmGdaMKRsXdd6nPVfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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