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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d4c2ec84629ebbf973b815f5f3db70061fd101e75837a245c2dca16b31326c' 
  AND token = 'AIQwoR4flThUwvrx62v8uvz3r4y5qB7Q1TDk7FqZxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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