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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628589989b5b314884d48dc8e2ef1b280e5ceb870ce2e9a6c5c9c9d973e4de2e' 
  AND token = 'o+3L04LeHkeWL564d3o+fZq8gEPUQib4BvdfF1VmyvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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