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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6004fa3a5358128afa58bc38fcd431e8099614f3ae99fc952b1b07311a422212' 
  AND token = 'I8EqC9eCQrbRdWWn5mfb5XSJayeC/45ZvjGPc69O42w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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