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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58d409225389f397b13236e27bf2d7d93508f5e459bc0fc1505865c0c1241aa' 
  AND token = '/k0M/nm0vlEC6mzON91opUl8M8gBPlFoFAIrsdKIMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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