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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24e04dddd0903d86d885d51ac352c68036fdb97ba59dcf41fe1cc4b1f5333e7' 
  AND token = '/Qcu6hS6wIqO6bWL0pZK2wx64TvOrWCuzj0l/vPO3ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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